CN103633284A - Liquid filling method of lithium ion battery - Google Patents
Liquid filling method of lithium ion battery Download PDFInfo
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- CN103633284A CN103633284A CN201310667120.2A CN201310667120A CN103633284A CN 103633284 A CN103633284 A CN 103633284A CN 201310667120 A CN201310667120 A CN 201310667120A CN 103633284 A CN103633284 A CN 103633284A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a manufacturing technology of a lithium ion battery and in particular relates to a liquid filling method of the lithium ion battery. The method comprises the following steps: 1, filling a lithium ion secondary battery to be filled with liquid with an electrolytic solution A containing vinylene carbonate for the first time, wherein the liquid filling quantity is 30%-45% by mass of the total liquid filling quantity; 2, forming; 3, filling the lithium ion secondary battery with an electrolytic solution B containing vinylene carbonate for the second time, wherein the liquid filling quantity is 25%-35% by mass of the total liquid filling quantity; 4, forming; 5, filling the lithium ion secondary battery with an electrolytic solution C containing vinylene carbonate for the third time, wherein the liquid filling quantity is 15%-25% by mass of the total liquid filling quantity; 6, forming; 7, filling the lithium ion secondary battery with an electrolytic solution D for the fourth time, wherein the liquid filling quantity is 10%-20% by mass of the total liquid filling quantity; 8, ageing and performing secondary encapsulation to obtain the lithium ion battery. According to the liquid filling method, the battery is promoted to form a stable and dense SEI (solid electrolyte interface) film, the charging frequency of the battery can be effectively increased, and the service life of the battery can be effectively prolonged.
Description
Technical field
The present invention relates to the manufacturing technology of lithium ion battery, specifically a kind of electrolyte filling method of lithium ion battery.
Background technology
Lithium ion battery has with respect to lead-acid battery, Ni-MH battery, nickel-cadmium cell that higher energy density, self discharge are little, the advantage such as have extended cycle life, the current consumer electronics field that has been widely used in.
Electrolyte is the important component part of lithium ion battery.It is carrier and the medium that lithium ion transmits between both positive and negative polarity, and lithium ion is also provided simultaneously.The conductivity of electrolyte is one of important parameter of electrolyte, and the performances such as the performance of electrode active material specific capacity, multiplying power are had to important impact.
It is solute that current conventional lithium-ion battery electrolytes is used LiPF6, the ester classes such as ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC) are main solvent, then add corresponding additive.
In lithium ion battery first charge-discharge process, electrode material and electrolyte react on solid-liquid phase interface, form one deck solid dielectric film (SEI film).SEI film is electronic body, is but the excellence conductor of Li+.On the one hand, the formation of SEI film, has consumed part lithium ion, and first charge-discharge irreversible capacity is increased, and has reduced the first charge-discharge efficiency of electrode material.And produce gas in this process, battery core performance is caused to harmful effect.
Present stage generally believe negative terminal surface SEI film on the impact of performance of lithium ion battery much larger than the surperficial SEI film of positive pole.The compatibility of electrolyte and negative pole graphite material is determined by the SEI film properties forming to a great extent.Lithium ion battery forms fine and close SEI film in the stage of changing into, if the SEI film forming is fine and close and complete not, may affect charge-discharge performance and the cycle performance of battery.In organic electrolyte, the most easily there is Double electron reduction reaction in vinylene carbonate (VC), as additive VC, impels effective formation SEI film.In view of this, necessaryly provide a kind of fluid injection chemical synthesizing method that can form high-quality SEI film, the safety and stability performance that improves battery guarantees that battery has good high-temperature behavior and cryogenic property simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of and can promote lithium ion cell electrode to form SEI film, the electrolyte filling method of the lithium ion battery of raising battery charging and discharging performance and cycle performance.
The electrolyte filling method of lithium ion battery of the present invention comprises the following steps:
Step 1, fluid injection for the first time, injects the electrolyte A that contains vinylene carbonate (VC) lithium rechargeable battery for the treatment of fluid injection; After fluid injection battery at normal temperatures the time of shelving be 12～24 hours, pole piece and barrier film are fully infiltrated; Reservoir quantity is 30～45% of total fluid injection quality; In electrolyte A, VC mass content is 8%～20%, and lithium salt is 0.5～2.0 mol/L;
Step 2, changes into, and the battery that step 1 is obtained carries out ageing, after sealing and standing, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 8～12h;
Step 3, fluid injection for the second time, will inject containing the electrolyte B of vinylene carbonate (VC), after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 25%～35% of total fluid injection quality; In electrolyte B, VC mass content is 4%～10%, and lithium salt is 0.5～2.0 mol/L;
Step 4, changes into, and the battery that step 3 is obtained changes into, and 0.05C constant current charge, to 3.4V, is shelved time 8～12h;
Step 5, fluid injection for the third time, the electrolyte C that will contain vinylene carbonate (VC) injects, after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 15%～25% of total fluid injection quality; In electrolyte C, VC mass content is 1%～5%, and lithium salt is 0.5～2.0 mol/L;
Step 6, changes into, and the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 8～12h;
Step 7, the 4th fluid injection, injects electrolyte D, after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 10%～20% of total fluid injection quality; In electrolyte D, lithium salt is 0.5～2.0 mol/L;
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12～24h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
Described electrolyte A-D is by solute lithium salts and organic solvent and mix and make, and described lithium salts is LiPF6 or LiBF4, and described solvent is the conventional solvent that this area lithium secondary cell electrolyte is used.Described solvent includes but not limited to ionic liquid, sulfone compound, cyanides, carbonic ester, sulfite, ether, acetonitrile, lactams or ketone etc., and described solvent is that a kind of independent use or more than one mixing are used.
The invention has the beneficial effects as follows: by substep fluid injection with change into, and the fluid injection of each step of choose reasonable and change into parameter, impel battery to form and stablize fine and close SEI film, charging times and the useful life that can effectively improve battery, promote the fail safe of battery.
Embodiment
Below in conjunction with comparative example and embodiments of the invention, the embodiment of the inventive method and implementation result are described further.
Comparative example 1:
Step 1, by contain vinylene carbonate (VC) and electrolyte A inject the lithium rechargeable battery treat fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.In electrolyte A, VC mass content is 8%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1 mol/L;
Step 2, ageing, changes into the battery obtaining in step 1, shelves, and extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
Comparative example 2:
Step 1, for the first time fluid injection: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.Reservoir quantity is 50% of total fluid injection weight, and in electrolyte A, VC mass content is 8%, and solvent is that solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1 mol/L;
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h;
Step 3, for the second time fluid injection: electrolyte B is injected, normal temperature shelf time 12h, reservoir quantity is 50% of total fluid injection weight.The mixed solvent that ethylene carbonate in electrolyte B (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, lithium salts is LiBF4, lithium salt is 1.0 mol/L;
Step 4, ageing: the battery obtaining in step 3 is changed into, extract the laggard row secondary encapsulation of unnecessary electrolyte and gas after ageing out and obtain lithium ion battery.
Comparative example 3:
Step 1, fluid injection for the first time: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection, after fluid injection, the time of shelving is 10h to battery at normal temperatures, pole piece and barrier film are fully infiltrated, reservoir quantity is 40% of total fluid injection weight, and in electrolyte A, VC mass content is 8%, the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, lithium salts is LiPF6, and lithium salt is 1 mol/L;
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h;
Step 3, fluid injection for the second time: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is total fluid-injecting amount 40%, in electrolyte B, VC mass content is 4%, the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, lithium salts is LiPF6, lithium salt is 1.0 mol/L;
Step 4, changes into: the battery that step 3 is obtained changes into, and 0.05C constant current charge, to 3.4V, is shelved time 10h;
Step 5, for the third time fluid injection: electrolyte C is injected, normal temperature shelf time 12h, injection rate is total implantation quality 20%; The mixed solvent that ethylene carbonate in electrolyte C (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, lithium salts is LiPF6, lithium salt is 1.0 mol/L.
Step 6, ageing: the battery obtaining in step 5 is changed into, extract the laggard row secondary encapsulation of unnecessary electrolyte and gas after ageing out and obtain lithium ion battery.
Embodiment 1:
Step 1, for the first time fluid injection: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.Reservoir quantity is 30% of total fluid injection weight.In electrolyte A, VC mass content is 8%, the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, lithium salt is 1 mol/L.
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, fluid injection for the second time: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 30% of total fluid injection quality, in electrolyte B, VC mass content is 4%, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1.0 mol/L.
Step 4, changes into: the battery that step 3 is obtained changes into, and 0.05C constant current charge, to 3.4V, is shelved time 10h.
Step 5, the electrolyte C that fluid injection for the third time will contain vinylene carbonate (VC) injects, normal temperature shelf time 12h, wherein injection rate is 20% of total fluid injection quality, in electrolyte C, VC mass content is 1%, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 6, changes into, and the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: electrolyte D is injected, normal temperature shelf time 12h, injection rate is 20% of total implantation quality, in electrolyte D, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, lithium salts is LiBF4, and lithium salt is 1.0 mol/L.
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
Embodiment 2:
Step 1, for the first time fluid injection: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.Reservoir quantity is 35% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1 mol/L.
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, for the second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 25% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1.0 mol/L.
Step 4, changes into: the battery that step 3 is obtained changes into, and 0.05C constant current charge, to 3.4V, is shelved time 10h.
Step 5, for the third time fluid injection: the electrolyte C that will contain vinylene carbonate (VC) injects, and normal temperature shelf time 12h wherein injection rate is 25% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 6, changes into: the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: electrolyte D is injected, normal temperature shelf time 12h, injection rate is total implantation quality 15%.In electrolyte D, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiBF4, and lithium salt is 1.0 mol/L.
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
Embodiment 3:
Step 1, for the first time fluid injection: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.Reservoir quantity is 40% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1 mol/L.
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, for the second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 30% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0 mol/L.
Step 4, changes into: the battery that step 3 is obtained changes into, and 0..05C constant current charge, to 3.4V, is shelved time 10h.
Step 5, the electrolyte C that fluid injection for the third time will contain vinylene carbonate (VC) injects, and normal temperature shelf time 12h wherein injection rate is 20% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 6, changes into, and the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: electrolyte D is injected, normal temperature shelf time 12h, injection rate is total implantation quality 10%.In electrolyte D, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0 mol/L.
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
Embodiment 4:
Step 1, for the first time fluid injection: the electrolyte A that contains vinylene carbonate (VC) is injected to the lithium rechargeable battery for the treatment of fluid injection.After fluid injection battery at normal temperatures the time of shelving be 10h, pole piece and barrier film are fully infiltrated.Reservoir quantity is 45% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1 mol/L.
Step 2, changes into: the battery that step 1 is obtained carries out ageing, after rubberizing sealing is static, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, for the second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 25% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0 mol/L.
Step 4, changes into: the battery that step 3 is obtained changes into, and 0..05C constant current charge, to 3.4V, is shelved time 10h.
Step 5, the electrolyte C that fluid injection for the third time will contain vinylene carbonate (VC) injects, and normal temperature shelf time 12h wherein injection rate is 15% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 6, changes into, and the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: electrolyte D is injected, normal temperature shelf time 12h, injection rate is total implantation quality 15%.In electrolyte D, solvent is the mixed solvent that ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are 1:1, and lithium salts is LiPF6, and lithium salt is 1.0 mol/L.
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
The battery of comparative example and the embodiment of the present invention is made: anode pole piece, Celgard2400 type polypropylene diaphragm and cathode pole piece are superimposed in order, reel, after hot pressing, pack in battery case.Battery cell is put in baking box, and at 80 ℃, vacuum bakeout is 24 hours, then battery cell is transferred between fluid injection, according to above-mentioned comparative example and the fluid injection of embodiment method.
Battery testing: by the battery cell preparing, change into certain technique, voltage range is 2.0 ~ 3.65V, the capacity of test battery monomer, high rate performance and the cycle performance of while test battery monomer, storge quality and security performance, constant current charge performance, testing impedance.Test battery is 40155 cylinder cells.
The battery performance test result that comparative example and embodiment make is as shown in the table.Data result is all to average after taking to test 5 times.
| ? | Testing impedance Ω (m Ω) | 1000 capability retentions of 1C/1C | 55 o500 capability retentions of C | Coulomb efficiency (%) first |
| Comparative example 1 | 2.45 | 78.0 | 83.1 | 91.0 |
| Comparative example 2 | 2.12 | 82.0 | 85.0 | 91.2 |
| Comparative example 3 | 1.94 | 82.5 | 86.0 | 91.6 |
| Embodiment 1 | 1.11 | 92.4 | 93.9 | 98.7 |
| Embodiment 2 | 1.32 | 87.4 | 92.4 | 97.3 |
| Embodiment 3 | 1.23 | 86.8 | 92.2 | 96.8 |
| Embodiment 4 | 1.35 | 87.6 | 91.8 | 97.4 |
As can be seen from the table, adopt electrolyte filling method of the present invention, coulomb efficiency first, high temperature cyclic performance, normal-temperature circulating performance all has than the better performance of comparative example.From testing impedance data, be also not difficult to find out, adopt electrolyte filling method of the present invention, battery cell has lower internal resistance.
Claims (2)
1. an electrolyte filling method for lithium ion battery, is characterized in that: comprises the following steps,
Step 1, fluid injection for the first time, injects the electrolyte A that contains vinylene carbonate the lithium rechargeable battery for the treatment of fluid injection; After fluid injection battery at normal temperatures the time of shelving be 12～24 hours, pole piece and barrier film are fully infiltrated; Reservoir quantity is 30～45% of total fluid injection quality; In electrolyte A, VC mass content is 8%～20%, and lithium salt is 0.5～2.0 mol/L;
Step 2, changes into, and the battery that step 1 is obtained carries out ageing, after sealing and standing, changes into, and 0.02C constant current charge is to 3.2V, and the time of shelving is 8～12h;
Step 3, fluid injection for the second time, will inject containing the electrolyte B of vinylene carbonate, after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 25%～35% of total fluid injection quality; In electrolyte B, VC mass content is 4%～10%, and lithium salt is 0.5～2.0 mol/L;
Step 4, changes into, and the battery that step 3 is obtained changes into, and 0.05C constant current charge, to 3.4V, is shelved time 8～12h;
Step 5, fluid injection for the third time, injects the electrolyte C that contains vinylene carbonate, after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 15%～25% of total fluid injection quality; In electrolyte C, VC mass content is 1%～5%, and lithium salt is 0.5～2.0 mol/L;
Step 6, changes into, and the battery that step 5 is obtained changes into, and with 0.1C constant current charge, to 3.45V, the time of shelving is 8～12h;
Step 7, the 4th fluid injection, injects electrolyte D, after fluid injection battery at normal temperatures the time of shelving be 12～24 hours, reservoir quantity is 10%～20% of total fluid injection quality; In electrolyte D, lithium salt is 0.5～2.0 mol/L;
Step 8, ageing, changes into the battery obtaining in step 7, with 0.2C constant current charge, to 3.65V, shelves time 12～24h, extracts the laggard row secondary encapsulation of unnecessary electrolyte and gas out and obtain lithium ion battery after ageing.
2. the electrolyte filling method of lithium ion battery according to claim 1, it is characterized in that: electrolyte A-D is by solute lithium salts and organic solvent and mix and make, described lithium salts is LiPF6 or LiBF4, and described solvent is the conventional solvent that lithium secondary cell electrolyte is used.
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| CN109065826A (en) * | 2018-07-06 | 2018-12-21 | 合肥国轩高科动力能源有限公司 | A kind of wetting method of high capacity high-pressure solid negative electrode lithium ion battery |
| CN109273663A (en) * | 2018-11-21 | 2019-01-25 | 惠州亿纬锂能股份有限公司 | A kind of battery electrolyte injection method |
| CN109638366A (en) * | 2018-11-23 | 2019-04-16 | 天津市捷威动力工业有限公司 | A kind of lithium ion battery benefit lithium method |
| CN109728239A (en) * | 2019-01-07 | 2019-05-07 | 惠州亿纬锂能股份有限公司 | A kind of electrolyte filling method of battery and its lithium ion battery of preparation |
| CN111916841A (en) * | 2020-09-24 | 2020-11-10 | 昆山宝创新能源科技有限公司 | Method for improving electrolyte infiltration effect of lithium battery and reducing diaphragm wrinkles and lithium battery |
| CN112151871A (en) * | 2020-09-28 | 2020-12-29 | 苏州酷卡环保科技有限公司 | Formation method of high-temperature lithium ion battery |
| CN111384450B (en) * | 2020-03-20 | 2021-05-11 | 广州明美新能源股份有限公司 | Liquid injection formation method of lithium ion battery |
| CN113394523A (en) * | 2021-05-21 | 2021-09-14 | 天能电池集团股份有限公司 | Acid adding and formation method for lead storage battery |
| CN113629365A (en) * | 2021-08-24 | 2021-11-09 | 蜂巢能源科技有限公司 | Electrolyte injection method and lithium ion battery |
| CN113904071A (en) * | 2021-09-28 | 2022-01-07 | 蜂巢能源科技有限公司 | Secondary liquid injection method and application thereof |
| CN113937366A (en) * | 2021-10-11 | 2022-01-14 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for shortening activation time of lithium storage battery and application |
| CN114204130A (en) * | 2021-12-08 | 2022-03-18 | 湖北亿纬动力有限公司 | Lithium ion battery and formation method and application thereof |
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| CN109728239A (en) * | 2019-01-07 | 2019-05-07 | 惠州亿纬锂能股份有限公司 | A kind of electrolyte filling method of battery and its lithium ion battery of preparation |
| CN109728239B (en) * | 2019-01-07 | 2022-07-12 | 惠州亿纬锂能股份有限公司 | Liquid injection method of battery and lithium ion battery prepared by same |
| CN111384450B (en) * | 2020-03-20 | 2021-05-11 | 广州明美新能源股份有限公司 | Liquid injection formation method of lithium ion battery |
| CN111916841A (en) * | 2020-09-24 | 2020-11-10 | 昆山宝创新能源科技有限公司 | Method for improving electrolyte infiltration effect of lithium battery and reducing diaphragm wrinkles and lithium battery |
| CN112151871A (en) * | 2020-09-28 | 2020-12-29 | 苏州酷卡环保科技有限公司 | Formation method of high-temperature lithium ion battery |
| CN113394523A (en) * | 2021-05-21 | 2021-09-14 | 天能电池集团股份有限公司 | Acid adding and formation method for lead storage battery |
| CN113629365A (en) * | 2021-08-24 | 2021-11-09 | 蜂巢能源科技有限公司 | Electrolyte injection method and lithium ion battery |
| CN113629365B (en) * | 2021-08-24 | 2023-05-23 | 蜂巢能源科技有限公司 | Electrolyte injection method and lithium ion battery |
| CN113904071A (en) * | 2021-09-28 | 2022-01-07 | 蜂巢能源科技有限公司 | Secondary liquid injection method and application thereof |
| CN113904071B (en) * | 2021-09-28 | 2023-05-26 | 蜂巢能源科技有限公司 | Secondary liquid injection method and application thereof |
| CN113937366A (en) * | 2021-10-11 | 2022-01-14 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for shortening activation time of lithium storage battery and application |
| CN113937366B (en) * | 2021-10-11 | 2023-11-03 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for shortening activation time of lithium storage battery and application |
| CN114204130A (en) * | 2021-12-08 | 2022-03-18 | 湖北亿纬动力有限公司 | Lithium ion battery and formation method and application thereof |
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